A Normalized Difference Vegetation Index (NDVI) image made from the same image that produced this false color infrared image: www.gigapan.com/gigapans/144700. NDVI highlights the difference between the red and the near infrared light that is reflected from foliage. In theory, the bigger the difference, the more photosynthetic activity there is. Yellow and red indicate more difference and higher NDVI values. A normal color version of this scene is here: www.gigapan.com/gigapans/144702..